xref: /openbmc/qemu/bsd-user/qemu.h (revision 795c40b8)
1 /*
2  *  qemu bsd user mode definition
3  *
4  *  This program is free software; you can redistribute it and/or modify
5  *  it under the terms of the GNU General Public License as published by
6  *  the Free Software Foundation; either version 2 of the License, or
7  *  (at your option) any later version.
8  *
9  *  This program is distributed in the hope that it will be useful,
10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  *  GNU General Public License for more details.
13  *
14  *  You should have received a copy of the GNU General Public License
15  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
16  */
17 #ifndef QEMU_H
18 #define QEMU_H
19 
20 
21 #include "cpu.h"
22 #include "exec/exec-all.h"
23 #include "exec/cpu_ldst.h"
24 
25 #undef DEBUG_REMAP
26 #ifdef DEBUG_REMAP
27 #endif /* DEBUG_REMAP */
28 
29 #include "exec/user/abitypes.h"
30 
31 enum BSDType {
32     target_freebsd,
33     target_netbsd,
34     target_openbsd,
35 };
36 extern enum BSDType bsd_type;
37 
38 #include "syscall_defs.h"
39 #include "target_syscall.h"
40 #include "target_signal.h"
41 #include "exec/gdbstub.h"
42 
43 #if defined(CONFIG_USE_NPTL)
44 #define THREAD __thread
45 #else
46 #define THREAD
47 #endif
48 
49 /* This struct is used to hold certain information about the image.
50  * Basically, it replicates in user space what would be certain
51  * task_struct fields in the kernel
52  */
53 struct image_info {
54     abi_ulong load_addr;
55     abi_ulong start_code;
56     abi_ulong end_code;
57     abi_ulong start_data;
58     abi_ulong end_data;
59     abi_ulong start_brk;
60     abi_ulong brk;
61     abi_ulong start_mmap;
62     abi_ulong mmap;
63     abi_ulong rss;
64     abi_ulong start_stack;
65     abi_ulong entry;
66     abi_ulong code_offset;
67     abi_ulong data_offset;
68     int       personality;
69 };
70 
71 #define MAX_SIGQUEUE_SIZE 1024
72 
73 struct sigqueue {
74     struct sigqueue *next;
75     //target_siginfo_t info;
76 };
77 
78 struct emulated_sigtable {
79     int pending; /* true if signal is pending */
80     struct sigqueue *first;
81     struct sigqueue info; /* in order to always have memory for the
82                              first signal, we put it here */
83 };
84 
85 /* NOTE: we force a big alignment so that the stack stored after is
86    aligned too */
87 typedef struct TaskState {
88     struct TaskState *next;
89     int used; /* non zero if used */
90     struct image_info *info;
91 
92     struct emulated_sigtable sigtab[TARGET_NSIG];
93     struct sigqueue sigqueue_table[MAX_SIGQUEUE_SIZE]; /* siginfo queue */
94     struct sigqueue *first_free; /* first free siginfo queue entry */
95     int signal_pending; /* non zero if a signal may be pending */
96 
97     uint8_t stack[0];
98 } __attribute__((aligned(16))) TaskState;
99 
100 void init_task_state(TaskState *ts);
101 extern const char *qemu_uname_release;
102 extern unsigned long mmap_min_addr;
103 
104 /* ??? See if we can avoid exposing so much of the loader internals.  */
105 /*
106  * MAX_ARG_PAGES defines the number of pages allocated for arguments
107  * and envelope for the new program. 32 should suffice, this gives
108  * a maximum env+arg of 128kB w/4KB pages!
109  */
110 #define MAX_ARG_PAGES 32
111 
112 /*
113  * This structure is used to hold the arguments that are
114  * used when loading binaries.
115  */
116 struct linux_binprm {
117         char buf[128];
118         void *page[MAX_ARG_PAGES];
119         abi_ulong p;
120         int fd;
121         int e_uid, e_gid;
122         int argc, envc;
123         char **argv;
124         char **envp;
125         char * filename;        /* Name of binary */
126 };
127 
128 void do_init_thread(struct target_pt_regs *regs, struct image_info *infop);
129 abi_ulong loader_build_argptr(int envc, int argc, abi_ulong sp,
130                               abi_ulong stringp, int push_ptr);
131 int loader_exec(const char * filename, char ** argv, char ** envp,
132              struct target_pt_regs * regs, struct image_info *infop);
133 
134 int load_elf_binary(struct linux_binprm * bprm, struct target_pt_regs * regs,
135                     struct image_info * info);
136 int load_flt_binary(struct linux_binprm * bprm, struct target_pt_regs * regs,
137                     struct image_info * info);
138 
139 abi_long memcpy_to_target(abi_ulong dest, const void *src,
140                           unsigned long len);
141 void target_set_brk(abi_ulong new_brk);
142 abi_long do_brk(abi_ulong new_brk);
143 void syscall_init(void);
144 abi_long do_freebsd_syscall(void *cpu_env, int num, abi_long arg1,
145                             abi_long arg2, abi_long arg3, abi_long arg4,
146                             abi_long arg5, abi_long arg6, abi_long arg7,
147                             abi_long arg8);
148 abi_long do_netbsd_syscall(void *cpu_env, int num, abi_long arg1,
149                            abi_long arg2, abi_long arg3, abi_long arg4,
150                            abi_long arg5, abi_long arg6);
151 abi_long do_openbsd_syscall(void *cpu_env, int num, abi_long arg1,
152                             abi_long arg2, abi_long arg3, abi_long arg4,
153                             abi_long arg5, abi_long arg6);
154 void gemu_log(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
155 extern THREAD CPUState *thread_cpu;
156 void cpu_loop(CPUArchState *env);
157 char *target_strerror(int err);
158 int get_osversion(void);
159 void fork_start(void);
160 void fork_end(int child);
161 
162 #include "qemu/log.h"
163 
164 /* strace.c */
165 struct syscallname {
166     int nr;
167     const char *name;
168     const char *format;
169     void (*call)(const struct syscallname *,
170                  abi_long, abi_long, abi_long,
171                  abi_long, abi_long, abi_long);
172     void (*result)(const struct syscallname *, abi_long);
173 };
174 
175 void
176 print_freebsd_syscall(int num,
177                       abi_long arg1, abi_long arg2, abi_long arg3,
178                       abi_long arg4, abi_long arg5, abi_long arg6);
179 void print_freebsd_syscall_ret(int num, abi_long ret);
180 void
181 print_netbsd_syscall(int num,
182                      abi_long arg1, abi_long arg2, abi_long arg3,
183                      abi_long arg4, abi_long arg5, abi_long arg6);
184 void print_netbsd_syscall_ret(int num, abi_long ret);
185 void
186 print_openbsd_syscall(int num,
187                       abi_long arg1, abi_long arg2, abi_long arg3,
188                       abi_long arg4, abi_long arg5, abi_long arg6);
189 void print_openbsd_syscall_ret(int num, abi_long ret);
190 extern int do_strace;
191 
192 /* signal.c */
193 void process_pending_signals(CPUArchState *cpu_env);
194 void signal_init(void);
195 //int queue_signal(CPUArchState *env, int sig, target_siginfo_t *info);
196 //void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info);
197 //void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo);
198 long do_sigreturn(CPUArchState *env);
199 long do_rt_sigreturn(CPUArchState *env);
200 abi_long do_sigaltstack(abi_ulong uss_addr, abi_ulong uoss_addr, abi_ulong sp);
201 
202 /* mmap.c */
203 int target_mprotect(abi_ulong start, abi_ulong len, int prot);
204 abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
205                      int flags, int fd, abi_ulong offset);
206 int target_munmap(abi_ulong start, abi_ulong len);
207 abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,
208                        abi_ulong new_size, unsigned long flags,
209                        abi_ulong new_addr);
210 int target_msync(abi_ulong start, abi_ulong len, int flags);
211 extern unsigned long last_brk;
212 void mmap_fork_start(void);
213 void mmap_fork_end(int child);
214 
215 /* main.c */
216 extern unsigned long x86_stack_size;
217 
218 /* user access */
219 
220 #define VERIFY_READ 0
221 #define VERIFY_WRITE 1 /* implies read access */
222 
223 static inline int access_ok(int type, abi_ulong addr, abi_ulong size)
224 {
225     return page_check_range((target_ulong)addr, size,
226                             (type == VERIFY_READ) ? PAGE_READ : (PAGE_READ | PAGE_WRITE)) == 0;
227 }
228 
229 /* NOTE __get_user and __put_user use host pointers and don't check access. */
230 /* These are usually used to access struct data members once the
231  * struct has been locked - usually with lock_user_struct().
232  */
233 #define __put_user(x, hptr)\
234 ({\
235     int size = sizeof(*hptr);\
236     switch(size) {\
237     case 1:\
238         *(uint8_t *)(hptr) = (uint8_t)(typeof(*hptr))(x);\
239         break;\
240     case 2:\
241         *(uint16_t *)(hptr) = tswap16((typeof(*hptr))(x));\
242         break;\
243     case 4:\
244         *(uint32_t *)(hptr) = tswap32((typeof(*hptr))(x));\
245         break;\
246     case 8:\
247         *(uint64_t *)(hptr) = tswap64((typeof(*hptr))(x));\
248         break;\
249     default:\
250         abort();\
251     }\
252     0;\
253 })
254 
255 #define __get_user(x, hptr) \
256 ({\
257     int size = sizeof(*hptr);\
258     switch(size) {\
259     case 1:\
260         x = (typeof(*hptr))*(uint8_t *)(hptr);\
261         break;\
262     case 2:\
263         x = (typeof(*hptr))tswap16(*(uint16_t *)(hptr));\
264         break;\
265     case 4:\
266         x = (typeof(*hptr))tswap32(*(uint32_t *)(hptr));\
267         break;\
268     case 8:\
269         x = (typeof(*hptr))tswap64(*(uint64_t *)(hptr));\
270         break;\
271     default:\
272         /* avoid warning */\
273         x = 0;\
274         abort();\
275     }\
276     0;\
277 })
278 
279 /* put_user()/get_user() take a guest address and check access */
280 /* These are usually used to access an atomic data type, such as an int,
281  * that has been passed by address.  These internally perform locking
282  * and unlocking on the data type.
283  */
284 #define put_user(x, gaddr, target_type)                                 \
285 ({                                                                      \
286     abi_ulong __gaddr = (gaddr);                                        \
287     target_type *__hptr;                                                \
288     abi_long __ret;                                                     \
289     if ((__hptr = lock_user(VERIFY_WRITE, __gaddr, sizeof(target_type), 0))) { \
290         __ret = __put_user((x), __hptr);                                \
291         unlock_user(__hptr, __gaddr, sizeof(target_type));              \
292     } else                                                              \
293         __ret = -TARGET_EFAULT;                                         \
294     __ret;                                                              \
295 })
296 
297 #define get_user(x, gaddr, target_type)                                 \
298 ({                                                                      \
299     abi_ulong __gaddr = (gaddr);                                        \
300     target_type *__hptr;                                                \
301     abi_long __ret;                                                     \
302     if ((__hptr = lock_user(VERIFY_READ, __gaddr, sizeof(target_type), 1))) { \
303         __ret = __get_user((x), __hptr);                                \
304         unlock_user(__hptr, __gaddr, 0);                                \
305     } else {                                                            \
306         /* avoid warning */                                             \
307         (x) = 0;                                                        \
308         __ret = -TARGET_EFAULT;                                         \
309     }                                                                   \
310     __ret;                                                              \
311 })
312 
313 #define put_user_ual(x, gaddr) put_user((x), (gaddr), abi_ulong)
314 #define put_user_sal(x, gaddr) put_user((x), (gaddr), abi_long)
315 #define put_user_u64(x, gaddr) put_user((x), (gaddr), uint64_t)
316 #define put_user_s64(x, gaddr) put_user((x), (gaddr), int64_t)
317 #define put_user_u32(x, gaddr) put_user((x), (gaddr), uint32_t)
318 #define put_user_s32(x, gaddr) put_user((x), (gaddr), int32_t)
319 #define put_user_u16(x, gaddr) put_user((x), (gaddr), uint16_t)
320 #define put_user_s16(x, gaddr) put_user((x), (gaddr), int16_t)
321 #define put_user_u8(x, gaddr)  put_user((x), (gaddr), uint8_t)
322 #define put_user_s8(x, gaddr)  put_user((x), (gaddr), int8_t)
323 
324 #define get_user_ual(x, gaddr) get_user((x), (gaddr), abi_ulong)
325 #define get_user_sal(x, gaddr) get_user((x), (gaddr), abi_long)
326 #define get_user_u64(x, gaddr) get_user((x), (gaddr), uint64_t)
327 #define get_user_s64(x, gaddr) get_user((x), (gaddr), int64_t)
328 #define get_user_u32(x, gaddr) get_user((x), (gaddr), uint32_t)
329 #define get_user_s32(x, gaddr) get_user((x), (gaddr), int32_t)
330 #define get_user_u16(x, gaddr) get_user((x), (gaddr), uint16_t)
331 #define get_user_s16(x, gaddr) get_user((x), (gaddr), int16_t)
332 #define get_user_u8(x, gaddr)  get_user((x), (gaddr), uint8_t)
333 #define get_user_s8(x, gaddr)  get_user((x), (gaddr), int8_t)
334 
335 /* copy_from_user() and copy_to_user() are usually used to copy data
336  * buffers between the target and host.  These internally perform
337  * locking/unlocking of the memory.
338  */
339 abi_long copy_from_user(void *hptr, abi_ulong gaddr, size_t len);
340 abi_long copy_to_user(abi_ulong gaddr, void *hptr, size_t len);
341 
342 /* Functions for accessing guest memory.  The tget and tput functions
343    read/write single values, byteswapping as necessary.  The lock_user function
344    gets a pointer to a contiguous area of guest memory, but does not perform
345    any byteswapping.  lock_user may return either a pointer to the guest
346    memory, or a temporary buffer.  */
347 
348 /* Lock an area of guest memory into the host.  If copy is true then the
349    host area will have the same contents as the guest.  */
350 static inline void *lock_user(int type, abi_ulong guest_addr, long len, int copy)
351 {
352     if (!access_ok(type, guest_addr, len))
353         return NULL;
354 #ifdef DEBUG_REMAP
355     {
356         void *addr;
357         addr = g_malloc(len);
358         if (copy)
359             memcpy(addr, g2h(guest_addr), len);
360         else
361             memset(addr, 0, len);
362         return addr;
363     }
364 #else
365     return g2h(guest_addr);
366 #endif
367 }
368 
369 /* Unlock an area of guest memory.  The first LEN bytes must be
370    flushed back to guest memory. host_ptr = NULL is explicitly
371    allowed and does nothing. */
372 static inline void unlock_user(void *host_ptr, abi_ulong guest_addr,
373                                long len)
374 {
375 
376 #ifdef DEBUG_REMAP
377     if (!host_ptr)
378         return;
379     if (host_ptr == g2h(guest_addr))
380         return;
381     if (len > 0)
382         memcpy(g2h(guest_addr), host_ptr, len);
383     g_free(host_ptr);
384 #endif
385 }
386 
387 /* Return the length of a string in target memory or -TARGET_EFAULT if
388    access error. */
389 abi_long target_strlen(abi_ulong gaddr);
390 
391 /* Like lock_user but for null terminated strings.  */
392 static inline void *lock_user_string(abi_ulong guest_addr)
393 {
394     abi_long len;
395     len = target_strlen(guest_addr);
396     if (len < 0)
397         return NULL;
398     return lock_user(VERIFY_READ, guest_addr, (long)(len + 1), 1);
399 }
400 
401 /* Helper macros for locking/unlocking a target struct.  */
402 #define lock_user_struct(type, host_ptr, guest_addr, copy)      \
403     (host_ptr = lock_user(type, guest_addr, sizeof(*host_ptr), copy))
404 #define unlock_user_struct(host_ptr, guest_addr, copy)          \
405     unlock_user(host_ptr, guest_addr, (copy) ? sizeof(*host_ptr) : 0)
406 
407 #if defined(CONFIG_USE_NPTL)
408 #include <pthread.h>
409 #endif
410 
411 #endif /* QEMU_H */
412